GPTZero review

GPTZero is built around the classroom: it scans text from ChatGPT, Gemini, Claude and Llama, highlights sentences that look AI-written, and flags text that was paraphrased or run through a bypass tool. The free plan gives 10,000 words a month, which covers a handful of essays, and the Chrome extension adds AI highlights in Gmail, Google Docs and Google Classroom. Premium costs $12.99 a month on annual billing for 300,000 words, multilingual detection and downloadable reports. Professional at $24.99 adds batch uploads of 250 files, page by page scanning and LMS integration with Canvas and Google Classroom. Writing Replay is the feature teachers ask about most: it replays how a Google Doc was written, including pastes. The trade-offs are that LMS links require the higher plan and the 99.9 percent accuracy figure is a vendor claim. We compared documented features and published prices.

Who it is for

Teachers who want a free start and classroom integrations

Price

Free plan with 10,000 words a month; Premium $12.99 per month billed annually.

$12.99 / month billed annually
Quoted from the vendor pricing page on November 12, 2026.

Key features

• Free plan with 10,000 words a month and 1 free Advanced Scan
• Premium covers 300,000 words a month with multilingual detection and downloadable reports
• Professional at $24.99 a month billed annually adds batch uploads of up to 250 files
• Writing Replay in Google Docs shows copy and pastes and typing patterns
• LMS integration with Canvas and Google Classroom

Strengths and weaknesses

• Strength: Free plan covers 10,000 words a month
• Strength: Sentence-level AI highlighting and paraphraser detection on paid plans
• Strength: Team plans start at 2 seats with no sales call
• Weakness: LMS integration sits on the $24.99 Professional plan
• Weakness: Character limit per scan is 50,000 on Premium
• Weakness: Accuracy figures on the site are the vendor's own claims

Key facts

• Free plan: Yes, 10,000 words a month
• Premium words: 300,000 a month
• LMS: Canvas, Google Classroom

Where it ranks

GPTZero is No. 1 in our Best AI Detectors verdict.